The SR Structure has six levels of hierarchy in census years, comprising in ascending hierarchical order: CDs-SLAs-SRSs-SRs-MSRs-S/Ts. In non-census years, with CDs undefined, it has only five levels of hierarchy (see ASGC Structural Chart, Chapter 1).

The spatial units in adjoining levels relate to each other by aggregation and disaggregation. For example, SRSs aggregate to SRs while SRs are disaggregates of MSRs. The spatial units within each level of the SR Structure cover the whole of Australia (as defined in Chapter 1) without gaps or overlaps.

Table

Detailed tables of the SR Structure are shown in Chapter 15 - The Classification Structures.